Hi
does anyone know how to specift spring stiffness to a compression only support? I know that a frictionless or frictional contact can be used, but the problem is the stiffness associated with these type contacts is not a real spring stiffness, just a relative value to allow for some...
The dynamic curves, allways have special conditions like frequency and relative dynamic displacement to the statics ones. It is not on top of my head, but there were two very important papers related on 1979 or so which became basics for API code. If you look at them carefully, you will find out...
To prevent plastic cracking in hot weather, you better use a white plastic foil to prevent heating of the surface and drying in very few minutes after placing the concrete. When the concrete gets a little of strength, you can remove the foil and use wet covers. If you could pour water on the...
It depends highly on the wlding procedure and the type of electrode you use. Also on the nature of the work you are performing. If you are just to weld pipes along to make a pipeline, the amount of weld metal can be calculated in each girth weld. Then you have to look at your electrode type, if...
Thanks for the comments. In fact the problem rises from a strange off-centeric fixed connection of a very stiff girder to a rather more flexible H-beam as support. Unfortunately, the box method you mentioned is not possible, as it chocks the space for fastenning the bolts! The best I could do...
You are quite right about the drift and lift. Drift, is sometimes called drag, but the idea is the same. The gust is the dynamic effect. The velocity is considered as a sum of a mean velocity, with the gustiness,i.e
v=v0+.5v0sin(2.pi.t/60)
This is a normal formula of wind velocity 'v' with a...
Sorry ishvag, but I don't get your point. The situation is like this: a long and stiff plate girder carrying a heavy bunker of row material is supported on a wide flange beam. The support is an end plate bolt connection type. The end plate is wlded ro the flanges of the H-section, so that the...
Hi every body,
I faced a rather rare problem of an H-Beam under torsional moment togehter with bending and shearing force. The designer seemingly designed it to resist against flexure and shear, as maximum nominal shear stress in the web is 0.38Fy, very close to the maximum alloeable 0.4Fy. A...
The procedure is to estimate the face area of the members of the tower exposed to the wind and calculate the drift force considering the shape factor of the members. As your tower is so tall and there are many members, you can calculate the area for any braced pannel and multiply it by the...
You have to look at some naval architect books. Sorry as it relates to many years ago, but I saw refference books considering the topics in detail. They are, however, not cheap and you have to see a good naval architecture department's library.
I think there are not many experiences on the torsion of nonsymetrical sections. Salmon & Jhonson, as you mentioned, developed the theory in a simple form as well as a more complex form for symetrical torsion. They have also made some comments on sections like channels. The idea would be so...
If the volume of the specimen is halved, which is the case when halving the thickness, we expect the absorbed energy would be halved as well. But be careful about the slenderness effects which come into account when the with/thk. ratio inceases. In this case a tendency to lateral buckling...
I forward you to the book " Foundation Analysis and Design" by Bowles, in which different methods to analyse such foundations are argued in detail. It will also reffere you to useful ACI code recommendations.
For you case, however, I doubt that using finite element technics would be...
Gentlemen!
I have problem when inserting a CAD drawing into a Microsoft word document. Either I do it with Insert Object menues or by copy clipboard and paste method, the properties of the lines,i.e. their thickness is lost. Even worse, the dimensions are not correctly transfered into the word...
I think the most important problem with your idea would be its cost. As the soil bears a certain stress, you will have to provide a definite bearing surface to transfere column loads to the ground, no matter you use concrete or steel for your foundation. In concrete, a high thickness provides...
